content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.parallel;
  
  import java.util.Comparator;
  
  import org.reactivestreams.Subscriber;
  
  import hu.akarnokd.rxjava3.operators.BasicMergeSubscription;
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.parallel.ParallelFlowable;
  
  /**
   * Merges the individual 'rails' of the source ParallelFlowable by picking
   * the next smallest available element from any 'rail' based on a comparator
   * into a single regular Publisher sequence (exposed as Flowable).
   * 
   * @param <T> the source value types
   * @author Simon Wimmesberger
   * @since 0.17.9
   */
  final class ParallelOrderedMerge<T> extends Flowable<T> {
  
      final ParallelFlowable<T> source;
  
      final Comparator<? super T> comparator;
  
      final boolean delayErrors;
  
      final int prefetch;
  
      ParallelOrderedMerge(ParallelFlowable<T> source,
              Comparator<? super T> comparator,
              boolean delayErrors, int prefetch) {
          this.source = source;
          this.comparator = comparator;
          this.delayErrors = delayErrors;
          this.prefetch = prefetch;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          final BasicMergeSubscription<T> parent = new BasicMergeSubscription<>(s, comparator, this.source.parallelism(), prefetch, delayErrors);
          s.onSubscribe(parent);
          parent.subscribe(this.source);
      }
  }
  